(516) 
mid-dorsal line, the top of the posterior ventral triangle at 16 cm. distance from 
the mid-dorsal line. The breadth of the interrupting band is 8 c‚m. 
Oxservation VI. A brown and white spotted male dog (Series IL, Nr. V). On 
Jan. 14th 1902 are cut through under aseptic conditions extradural; to the right 
the 10th, 11th, 12th, 14th, 15th and 16th pair of roots and to the left the 11th, 
19th, 14th and 15th pair of roots. The autopsy on Febr. 3rd confirms that the 
13th has been left intact on both sides. 
The sensibility, determined on Jan. 15th and Febr. 2nd, offers only slight dif- 
ferences, and the relation between analgetic and sensible areas is represented in 
fig. 26 as it has been found existing on Jan. 15th. 
Fig. 26. The 13th dermatoma 
to the right between three sectioned roots on each side, to the left between 
two sectioned roots on each side. 
R 1E ST DE. 
Measurings. | Mid-dorsal line. Largest breadth Mid- 
of central area. ventral line. 
Measurings on Jan. 158 Febr.24 Jan. 15th Febr.24 Jan. 15" Febr. 24 
Cranial analgetic area Interrupted Interrupted 
(3 roots) 3.7¢.M. 3 cm. (overl.5e.m) (over2e.m.) 6.5¢.m. 6.4 e.m. 
sensible area (1 root) 35 , 42, 4.7 , GO as ee Deas 
Caudal analgetic areas 4 Pe ted ok: Bi sO re aoe 
(3 roots) 
On Febr. 2d the distance from the mid-dofsal to the mid-ventral line is 22.1 ¢.m. 
in the cranial, 21.2 em. in the caudal area. 
The top of the dorsal triangle is situated at 5.5 c.m. distance from the mid-dorsal 
line; the top of the ventral triangle at 13.5 c.m. distance from the mid-ventral 
line; the breadth of the interrupting band is 2 c.m. 
On Febr. 2d the most important narrowing in the caudal area is found at 9 cm, 
distance trom the mid-dorsa], at 12 e‚m. distance from the mid-ventral line, 
